<body>
Provides function and operator classes. Each predefined function is contained
in this package as a class. Operators are also contained in classes such as
Add, Subtract, Multiply, or Comparative. Interfaces and supportive classes are:
<ul>
<li>PostfixMathCommand</li>
<li>PostfixMathCommandI</li>
<li>ComplexPFMC</li>
<li>SpecialEvaluationI</li>
</ul>
</body>
